I have always wondered whether you lefong at rapid. I guess you don't. Well, I did it, not at the opening, (spoiler alert) but at the endgame! And guess what, the opponent didn't see it, and gave a premove at that point as my time neared 0 seconds. And yk, I got a huge success after my apparent "blunder" (sorry Coach) as I checkmated him in the last 5.3 seconds. Pretty strange, nuh?